Add repository links to the main page

Signed-off-by: Piotr Katarzynski <pkatarzynski@antmicro.com>

docs/index.rst

diff --git a/docs/index.rst b/docs/index.rst
index 1d30453..a9d72cd 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -46,6 +46,14 @@
 .. include:: status.rst
     :start-after: current_status_text
 
+Resources
+=========
+
+The latest SkyWater SKY130 PDK design resources can be downloaded from the following repositories:
+
+* `github.com/google/skywater-pdk <https://github.com/google/skywater-pdk>`_
+* `cs.opensource.google/skywater-pdk <https://cs.opensource.google/skywater-pdk>`_
+* `foss-eda-tools.googlesource.com/skywater-pdk <https://foss-eda-tools.googlesource.com/skywater-pdk/>`_
 
 Indices and tables
 ==================